意图4规定，开放源码软件是透明的，可以作为源代码免费获得。
Intention 4 stipulates that open source software be transparent, available as source code for no fee.
PHP的源代码可以免费获取，您可以自由编写和分发PHP应用程序，将其用于商业和非商业用途。
The source code for PHP is freely available, and you are free to write and distribute PHP applications for both commercial and non-commercial use.
MPS是免费的，大多数源代码在Apache 2许可下可用。
MPS is free, most source code being available under Apache 2 License.
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